ASTM C151
Full Name
ASTM C151 – Standard Test Method for Autoclave Expansion of Hydraulic Cement
Scope
ASTM C151 is a standard test method that outlines the procedure for determining the autoclave expansion of hydraulic cement. Autoclave expansion is the increase in volume of a cement paste after being subjected to high pressure and temperature in an autoclave. This property is important for evaluating the potential for alkali-aggregate reaction, a type of chemical reaction that can cause concrete to crack and deteriorate.
Key procedures specified in ASTM C151 include:
- Paste preparation: a standard cement paste is prepared using the specified proportions of cement and water. The paste is mixed to a specific consistency, ensuring uniform distribution of the components.
- Molding: the prepared paste is molded into small test cylinders of a specified size. The cylinders are carefully compacted to eliminate air voids and ensure consistent density.
- Autoclaving: the molded cylinders are placed in an autoclave, which is a sealed chamber that can be pressurized and heated. The autoclave is heated to a specific temperature, typically 180°C (356°F), and pressurized to a specific pressure, typically 1500 psi (10.3 MPa). The cylinders are subjected to these conditions for a specified period, usually 24 hours.
- Measurement: after autoclaving, the cylinders are removed from the autoclave and allowed to cool to room temperature. The length of each cylinder is measured using a precise measuring instrument. The autoclave expansion is calculated by comparing the measured length to the original length of the cylinder.
ASTM C151 Accredited Laboratory
Applied Testing & Geosciences, LLC is accredited for performing tests using the ASTM C151 standard. By partnering with us, you can evaluate the potential for alkali-aggregate reaction in your concrete mixtures and select cements that are less susceptible to this problem. Our testing services can help you ensure the durability and performance of your concrete structures by identifying and mitigating potential risks associated with alkali-aggregate reaction.
Contact us today to learn more about our testing capabilities and how we can support your business.
Resources
Keywords
hydraulic cement; autoclave expansion; alkali-aggregate reaction; paste preparation; molding; autoclaving; measurement; potential; durability; performance; concrete mixtures; susceptible; problem; testing services; compliance; standard test method; procedures; determination; quality; stone products; cement; water; consistency; uniform distribution; components; test cylinders; sealed chamber; pressurized; heated